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Glucose Homeostasis: Regulation of Blood Glucose01:02

Glucose Homeostasis: Regulation of Blood Glucose

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Carbohydrates consumed through foods are converted into glucose, a crucial energy source for the body. In the prandial state, high blood glucose levels stimulate the secretion of insulin from the pancreas. Insulin inhibits hepatic glucose production and stimulates glucose uptake and metabolism by muscle and adipose tissue. The excess glucose is converted into glycogen and stored in the liver and muscles.
During fasting, when blood glucose levels are low, the pancreas secretes glucagon. it...
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Concentration Cells02:41

Concentration Cells

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A concentration cell is a type of a  voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
Consider the following voltaic cell:
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Glucose Transporters01:27

Glucose Transporters

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Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the movement of other hexoses such as fructose, mannose, and galactose.
Facilitated diffusion-glucose transporters (GLUTs) are encoded by the solute-linked carrier (SLC) family 2, subfamily A gene family, or SLC2A. The 14 GLUT protein members are distributed into three classes:
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Solution Concentration and Dilution02:59

Solution Concentration and Dilution

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The relative amount of a given solution component is known as its concentration. Often, though not always, a solution contains one component with a concentration that is significantly greater than that of all other components. This component is called the solvent and may be viewed as the medium in which the other components are dispersed or dissolved. Solutions in which water is the solvent are, of course, very common on our planet. A solution in which water is the solvent is called an aqueous...
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Concentration and Rate Law03:03

Concentration and Rate Law

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The rate of a reaction is affected by the concentrations of reactants. Rate laws (differential rate laws) or rate equations are mathematical expressions describing the relationship between the rate of a chemical reaction and the concentration of its reactants.
For example, in a generic reaction aA + bB ⟶ products, where a and b are stoichiometric coefficients, the rate law can be written as:
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Stress Concentrations01:13

Stress Concentrations

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The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress...
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Updated: Jan 20, 2026

Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors
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Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors

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Optofluidic microcapillary biosensor for label-free, low glucose concentration detection.

Hongdan Wan1,2, Jijing Chen1, Cheng Wan3

  • 1Nanjing University of Posts and Telecommunications, Nanjing 210023, China.

Biomedical Optics Express
|August 28, 2019
PubMed
Summary

This study presents a novel optofluidic microcapillary biosensor for label-free glucose detection. The device achieves sensitive, low-concentration glucose measurement with high specificity and cost-effectiveness.

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Area of Science:

  • Biomedical Engineering
  • Optics and Photonics
  • Analytical Chemistry

Background:

  • Accurate glucose monitoring is crucial for diabetes management.
  • Existing methods often require complex sample preparation or labeling.
  • Label-free biosensing offers a simplified and potentially more cost-effective approach.

Purpose of the Study:

  • To develop and characterize an optofluidic microcapillary biosensor for label-free glucose detection.
  • To demonstrate the sensor's capability for detecting low glucose concentrations relevant to cellular levels.
  • To investigate the key parameters influencing sensor performance.

Main Methods:

  • Fabrication of an optofluidic microcapillary with a thin wall (2 μm) and high Q factor (1.3 × 10^6).
  • Bio-chemical functionalization of the microcapillary surface for glucose detection.
  • Utilizing whispering gallery mode resonance for label-free detection.
  • Characterization of sensitivity and bulk refractive index sensitivity.

Main Results:

  • Achieved label-free detection of glucose concentrations as low as 2.78 mM.
  • Measured sensitivity of 0.966 pm/mM.
  • Demonstrated high bulk refractive index sensitivity (23.36 nm/RIU).
  • Sensor exhibits high resistance to environmental perturbation and requires a small sample volume (90 nL).

Conclusions:

  • The developed optofluidic microcapillary biosensor is effective for sensitive, label-free glucose detection.
  • Sensor performance is influenced by microcapillary wall thickness and liquid core refractive index.
  • The biosensor offers advantages in terms of cost-effectiveness, sample volume, and stability.